Getting back to weed control in Canada; seeding with the proper turf type, mowing high, and proper nutrition, irrigation and aeration will help reduce many weeds. You will soon have another tool to use in Canada, ADIOS Weed Killer will most likely be approved for use this year.

McGill University http://www.mcgill.ca/macdonald/ did the research in developing this all natural selective post-emergent herbicide. McGill also owns the patent.
It was approved in the US last year and is EPA Exempt. We sent samples for field tests to several of our landscapers & LCOs and they were pleased with the results.

ADIOS is DSMA, an organo aresenate compound. I don't see how a known carcinogen will be approved when a relatively safe chemical such as glyphosate is banned. Also, it is banned in the U.S.